Big Boy No. 4014 is the largest steam locomotive.
Union Pacific's Big Boy No. 4014 steams through Marana, Arizona.
Union Pacific's Big Boy No. 4014 near Marana, Arizona.
Going away view of Big Boy No. 4014 leaving Rillito, Arizona.
Union Pacific's Big Boy No. 4014 near Benson, Arizona.
Union Pacific's Big Boy steaming through Cochise County Arizona.
Black and white photo of the largest steam locomotive in the world and the last one still running.
Big Boy No. 4014 barreling through Cochise County, Arizona USA.
Black and white image of Big Boy in the Arizona countryside.
Three quarter view of Big Boy in Cochise County, Arizona.
View of Big Boy No. 4014 from as is lumbers east from Tucson, Arizona.
Big Boy No. 4014 heading east from Tucson Arizona.
The only Big Boy steam locomotive still running passes between Tucson and Willcox Arizona.
Big Boy 4014 barrels through Cochise County Arizona.
Last railcar of Union Pacific's Big Boy Tour in Cochise County Arizona.
Union Pacific's Big Boy No. 4014 steam locomotive approaching Benson, Arizona. Big Boy is the largest steam locomotive in the world and the last one running.
Union Pacific's Big Boy No. 4014 leaving Benson, Arizona.
Two engineers on Union Pacific's Big Boy in Willcox, Arizona.
Steam escaping from Big Boy in Willcox, Arizona.
Sign on Big Boy 4014 from American Locomotive Company Schenectady Works November 1941.
Black and white image of the front of Union Pacific's Big Boy locomotive in Willcox, Arizona.
Union Pacific's Big Boy steam locomotive stopped in Willcox, Arizona.
Steam locomotive enthusiasts photograph Big Boy while stopped in Willcox Arizona.
Big Boy No. 4014, the largest steam locomotive in the world is stopped in Willcox, Arizona.
Medallion on the last car of Union Pacific's Big Boy Tour.
